/*字体样式*/
.my_font{
    font-style: italic;
    font-weight: bolder;
    font-size: 2.75em;
    font-family: 华文中宋,serif;
    line-height: 5rem;/*;5px*16=80px*/
    /*!*line-height: 5em;*!  5*font-size(2.75em)=5*2.75*16px=220px*/
}

/*文本样式*/
.my_text{
    border:1px solid black;
    width:30rem;
    height:10rem;
    letter-spacing:1rem;
    line-height: 2rem;
    text-indent:1rem;
    text-align:center;
    vertical-align: middle;
}

/*颜色样式*/
.my_color{
    border:1px solid black;
    width:30rem;
    height:10rem;
    color:blue;
}
/*背景样式*/
.my_bg{
    border: 1px solid black;
    width: 50rem;
    height:20rem;
    background:#c82333 url("https://www.baidu.com/img/bd_logo1.png")no-repeat -30px -90px;
}
/*列表样式*/
.my-list{
    list-style-type:circle;
    list-style-image:url(http://www.jju.edu.cn/images/ico1.gif);
}
/*盒子模型*/
.my_box{
    width: 50rem;
    height:20rem;
    border: 1px solid black;
    margin:1rem 1rem;
    padding:1rem;

}
